High Si alloys are recognized to have excellent corrosion resistance, especially in mineral acids, but are usually brittle due to compound formation. Nickel silicide, Ni3Si is one compound that has improved ductility through a combination of micro and macro alloying. Nb and Si have been added to create a patented cast alloy with excellent corrosion resistance to sulfuric acid and good mechanical properties. In this paper, efforts to optimize the alloys performance are presented along with progress toward the development of a wrought version of the material. It was found that an appropriate heat treatment provides the largest improvement in the cast Ni-Si alloys' microstructure. The identification of G phase as a detrimental phase has lead to efforts to eliminate or make innocuous this factor. Trials have resulted in more than a 50% reduction by the cold rolling process. This process not only increases homogenization but also results in a decreased area fraction of G phase with a more uniform distribution, which should be beneficial for both improvements in ductility and corrosion resistance.